krb5-config dependency is not handled at all

[roxanagherle]

Installing pykerkeros (v1.1.9) from source fails with the error:
File "/tmp/pip-build-SpfsFD/pykerberos/setup.py", line 57, in
krb5_ver = check_krb5_version()
File "/tmp/pip-build-SpfsFD/pykerberos/setup.py", line 50, in check_krb5_version
if len(krb5_vers) == 4:
TypeError: object of type 'NoneType' has no len()

Shouldn't this dependency with krb5-config be handled by the pykerberos lib?